0614BagwormTreatmentdbsr.cfm Bagworm treatment needs to start, experts say
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Bagworm treatment needs to start, experts say

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By David G. Hallauer

Meadowlark District Extension Agent

Our “normal” window for treating bagworms is the last week of June and first week of July.

We do it then so that all overwintered eggs will have hatched with larvae still small and more susceptible to insecticides. But this spring hasn’t been normal, moving the treatment window forward a few weeks.

With that in mind, the time to spray is now—if you have bagworms. Make sure you do a visual inspection before spraying (bagworms are of sufficient size for easy detection) in case natural predators have done a good job of taking care of them already. Treat while small before further damage can be done.

When choosing an insecticide, concern yourself less with the active ingredient (all do a good job), and more with application method. Be timely, after all eggs have hatched and while small, get thorough spray coverage. According to Kansas State University entomologist Bob Bauernfeind, the main reason for failure is that merely applying an insecticide in a mist-like manner effects only those bagworms feeding on the periphery of the tree and shrub, with those in the more dense areas remaining unscathed. Make sure you get thorough coverage.

Date: 6/24/2013



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